In The Name of Allaah, The Most Merciful The Bestower of Mercy
A great number of the of the people would say when they greet one another; ”Sabaahul-Khayr or Masaa-ul Khayr!” The respond to this greeting is: ”Sabaahun Noor and Masaa-in Noor”. This greeting is a Magian greeting (i.e. a greeting of the fire worshippers).
The Magians believe in two powerful (forces): The forces of Good and Evil, which they compare to Light and Darkness. The Magians have two gods: The god of goodness or light and the god of evil or darkness, and that these two (gods) contend with one another to rule the world. So this is the reason the Magians greet one another with their statement: Sabaahul Khayr-Sabaahun-Noor, whilst Islaam has commanded us (Muslims) to greet with the Islaamic Greeting ”As-Salaamu-Alaykum’.
[Source: Mu’jamul Manaahiyy Lil-laf-dhiyyah (page:334-335) of Sheikh Bakr Abu Zaid (rahimahullaah)]
Abu Mu-aawiyyah (Abdullaah Al-Gambi)